Repositorio Académico de la Universidad de Chile: Recent submissions

Now showing items 43501-43520 of 101560

    • Zinc transport in mammalian cells 
      Reyes, Juan G. (American Physiological Society, 1996)
      The importance of zinc in cell physiology is related mainly to its intracellular involvement in enzyme catalysis, protein structure, protein- protein interactions, and protein-oligonucleotide interactions. The mechanisms ...
    • Interleukin 1 and tumor necrosis factor in obese alcoholics compared with normal-weight patients 
      Bunout Barnett, Daniel; Muñoz, Carlos; López, Marcelo; Maza Cave, María Pía de la; Schlesinger, Liana; Hirsch Birn, Sandra; Pettermann, Margarita (American Society for Nutrition, 1996)
      We performed a liver biopsy and measured plasma concentrations of interleukin 1β (IL-1β) and tumor necrosis factor α (TNF-α), and spontaneous and lipopolysaccharide-stimulated in vitro monocyte production of IL-1β and TNF-α ...
    • Altered maternal psychological profile as health risk factor in poor urban infants 
      Araya, M.; Espinoza, J.; Zegers, B.; Cruchet, S.; Brunser, O.; Humphreys, D.; Fernandez, C. L. (1996)
      To test the hypothesis that the increased health risk of children selected by a previously calculated and validated predictive model is associated with some maternal psychological characteristics, the universe of 107 mothers ...
    • Calcium and gadolinium ions stimulate the GTPase activity of purified chicken brain tubulin through a ... 
      Soto, Claudio; Rodríguez, Patricio H.; Monasterio Opazo, Octavio (1996)
      Ca2+ and Gd3+ stimulated the GTPase activity of chicken brain tubulin 13- and 26-fold, respectively. Mg2+, Tb3+, and Na+ had no effect. This GTPase activity showed a saturation behavior with Ca2+ and Gd3+ with a maximal ...
    • Studies related to progesterone-induced hamster sperm acrosome reaction 
      Llanos Silva, Miguel; Anabalón, Mireya C. (1996)
      Experiments were designed to characterize the effect of progesterone on the hamster sperm acrosome reaction (AR). Progesterone stimulated exocytosis of previously capacitated spermatozoa in a dose-dependent manner. ...
    • Cardiovascular responses to graded degrees of hypoxaemia in the llama fetus. 
      Llanos,; Riquelme,; Moraga,; Cabello,; Parer, (1995)
      The fetal llama exposed to an intense degree of hypoxaemia did not increase cerebral blood flow, but showed a marked peripheral vasoconstriction. The same cardiovascular response is observed in fetal sheep submitted to a ...
    • Neuronal changes induced by chronic toluene exposure in the cat 
      Saavedra Saavedra, Iván; De Marinis,; Palestini, (1996)
      Chronic toluene inhalation provokes significant deleterious neurological effects in young glue sniffers and exposed workers. We have developed a chronic toluene inhalation model in the cat to address this issue. Neuronal ...
    • Karyotype variability in Trypanosoma rangeli 
      Henriksson, J.; Solari Illescas, Aldo; Rydåker, M.; Sousa, O. E.; Pettersson, U. (Cambridge University Press, 1996)
      The molecular karyotypes of several different protozoan parasites show high intra-species variation, including different kinetoplastids such as Trypanosoma brucei, Trypanosoma cruzi and Leishmania ssp. In this study, the ...
    • Effect of constant light on fetal and maternal prolactin rhythms in sheep 
      Parraguez Gamboa, Víctor; Valenzuela, Guillermo J.; Vergara, Marcela; Ducsay, Charles A.; Yellon, Steven M.; Serón Ferré, María (Endocrine Society, 1996)
      A 24-h rhythm of plasma PRL is present in fetal sheep. This rhythm is synchronized to an environmental clue (zeitgeber). We determined whether the light-dark cycle (L:D) is a zeitgeber for the fetal PRL rhythm and, if ...
    • Glutathione and trypanothione in several strains of Trypanosoma cruzi: Effect of drugs 
      Repetto Scaramelli, Yolanda; Opazo, Eduardo; Maya Arango, Juan; Agosin, Moises; Morello Casté, Antonio (Elsevier Inc., 1996)
      Glutathione (GSH), trypanothione (T(SH)2) and glutathionyl spermidine (GSH-SP) concentrations were determined in the Tulahuen and LQ strains and the DM 28c clone of Trypanosoma cruzi. The concentrations of GSH, T(SH)2 and ...
    • Neurite outgrowth through lesions of neonatal opossum spinal cord in culture 
      Varga, Z. M.; Fernandez, J.; Blackshaw, S.; Martin, A. R.; Muller, K. J.; Adams, W. B.; Nicholls, J. G. (1996)
      The aim of these experiments was to analyze neurite outgrowth during regeneration of opossum spinal cord isolated from Monodelphis domestica and maintained in culture for 3-5 days. Lesions were made by crushing with forceps. ...
    • Tubulin domains for the interaction of microtubule associated protein DMAP-85 from Drosophila melanogaster 
      Henríquez, Juan P.; Cambiazo Ayala, Verónica; Maccioni Baraona, Ricardo (1996)
      The interaction of microtubule associated proteins (MAPs) with the microtubule system has been characterized in depth in neuronal cells from various mammalian species. These proteins interact with well-defined domains ...
    • The casein kinase 1α gene of Drosophila melanogaster is developmentally regulated and the kinase activity ... 
      Santos, João A.; Logarinho, Elsa; Tapia, Claudio; Allende, Catherine C.; Allende, Jorge E.; Sunkel, Claudio E. (1996)
      We report the molecular cloning and characterisation of the first CK1 (casein kinase) gene of Drosophila melanogaster (dmCK1). The protein sequence (DMCK1) shares significant homology with other mammalian CK1 protein kinases ...
    • Obesity as a protective factor for postmenopausal osteoporosis 
      Albala Brevis, Cecilia; Yáñez, M.; Devoto, Enzo; Sostin, C.; Zeballos, L.; Santos, J. L. (1996)
      Background: Obesity is considered a protective factor for osteoporosis improving bone mass and maintaining higher levels of estrogen during menopause. Objective: To determine the association of obesity with bone mineral ...
    • Developmental changes and differential regulation by testosterone and estradiol of growth hormone receptor ... 
      Yu, Yu M.; Domené, Horacio M.; Sztein, Jorge; Counts, Debra R.; Cassorla Goluboff, Fernando (BioScientifica Ltd., 1996)
      To investigate the effects of testosterone and estradiol (E2) on growth hormone receptor (GH-R) gene expression, we measured GH-R mRNA levels in relation to the changes of sex steroid concentrations in the normal male ...
    • Fluconazole in treatment of urinary candidiasis. Experience with 24 patients Fluconazol en el tratamiento ... 
      Thompson,; Pino,; Castrillón,; Schenone,; del Canto, (1995)
      Since fluconazole achieves high urine concentrations, we assessed its usefulness in the treatment of urinary candidiasis. We studied 24 patients (8 male) aged 23 to 97 years old, that presented pyuria with a negative urine ...
    • Seasonality and freezability vs routine parameters in stallion semen 
      Rodriguez, Nicole; Bustos-Obregon, (1996)
      The fertilizing ability of stallion semen was analyzed using fresh and frozen samples, obtained before (June-July) or during (October-November) the breeding season. Thirty ejaculates obtained from 4 stallions, were used. ...
    • Copper as an essential nutrient 
      Olivares, Manuel; Uauy Dagach-Imbarack, Ricardo (American Society for Nutrition, 1996)
      Animal and human studies have shown that copper is involved in the function of several enzymes. Studies have also shown that copper is required for infant growth, host defense mechanisms, bone strength, red and white cell ...
    • Cyclic AMP-dependent protein kinase and mechanical heart function in ventricular hypertrophy induced by ... 
      Piddo Mijares, Ana María; Sánchez, María Isabel; Sapag Hagar, Mario; Corbalán, Ramón; Foncea, Rocío; Ebensperger González, Roberto; Godoy, Iván; Meléndez, Jaime; Jalil Milad, Jorge; Lavandero González, Sergio (Academic Press, 1996)
      The role of cyclic AMP-dependent protein kinase (PKA) and systolic function during the development of left ventricular hypertrophy (LVH) still remain uncertain. The aim of this work is to study PKA activity and mechanical ...
    • Epidemic typhoid in Chile: Analysis by molecular and conventional methods of Salmonella typhi strain diversity ... 
      Fica, Alberto E.; Prat-Miranda, Soledad; Fernandez-Ricci, Alda; D'Ottone, Karin; Cabello, Felipe C. (1996)
      From 1977 to 1986, Chile experienced an important typhoid fever epidemic, despite statistics that indicated apparently improving levels of sanitation of drinking water and sewage disposal. The lack of antibiotic resistance ...